diff --git a/backend/db.sqlite3 b/backend/db.sqlite3
deleted file mode 100644
index e69de29..0000000
diff --git a/backend/shop/migrations/0029_fix_legacy_fields.py b/backend/shop/migrations/0029_fix_legacy_fields.py
new file mode 100644
index 0000000..85c1d23
--- /dev/null
+++ b/backend/shop/migrations/0029_fix_legacy_fields.py
@@ -0,0 +1,23 @@
+# Generated by Django 6.0.1 on 2026-02-12 14:33
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('shop', '0028_fix_goodsid_schema'),
+    ]
+
+    operations = [
+        # 1. 将 product_name 字段改为可为空
+        migrations.RunSQL(
+            sql="ALTER TABLE shop_order ALTER COLUMN product_name DROP NOT NULL;",
+            reverse_sql="ALTER TABLE shop_order ALTER COLUMN product_name SET NOT NULL;"
+        ),
+        # 2. 将 unit_price 字段改为可为空
+        migrations.RunSQL(
+            sql="ALTER TABLE shop_order ALTER COLUMN unit_price DROP NOT NULL;",
+            reverse_sql="ALTER TABLE shop_order ALTER COLUMN unit_price SET NOT NULL;"
+        ),
+    ]